.nav {
  display: flex;
  align-items: center;
  width: 100%;
  height: 60px;
  background-color: #1890ff;
  .logo_wrap {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: url(../../assets/images/bugu.jpg) no-repeat center center;
    background-size: 100% 100%;
    overflow: hidden;
    margin-left: 10px;
  }
  .logo_wrap:hover {
    opacity: .8;
    cursor: pointer;
  }
  .loginOrMenu {
    margin-left: auto; // 父盒子为flex盒子时， 此属性让该子盒子居右显示
  }
}